Design upgrades and repairs at Tri-State`s 110 MWe Nucla CFB
Conference
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OSTI ID:245046
- Tri-State Generation and Transmission Association, Inc., Montrose, CO (United States)
- Ahlstrom Pyropower Customer Services, Inc., San Diego, CA (United States)
- Combustion Systems Inc., Boulder, CO (United States)
During the summer of 1994, significant modifications were made to various components of the original 110 MWe Nucla CFB following seven years of service. This was carried out by the new owners of the station, Tri-State Generation and Transmission Association Inc. (Tri-State), as part of an effort to reduce maintenance costs and improve the reliability and availability of the station. Areas of the original design that were upgraded include the secondary superheaters in the upper combustor area, the air distributors, combustor and cyclone refractories, and expansion joints between the boiler and hot cyclone. In addition, approximately 30 percent of the original water wall surface was replaced to correct damage sustained during an overheat incident in 1987. During this replacement, kick-out water wall tubes were installed in the lower combustor at the refractory interface. Modifications also were completed on the lower combustor wall boxes and on the bent water wall tubes forming the primary and secondary air port openings. At the conclusion of the construction period, boiler tests were completed, thereby demonstrating that the original performance of the unit was not compromised by the design changes and that guarantees were met. Through the first nine months of 1994, unit reliability has seen marked improvements with an average availability of 88 and capacity factor of 83%. Cursory inspections during this period indicate good integrity on all refractories, pressure and non-pressure parts, and welds completed during the 1993 outage.
- OSTI ID:
- 245046
- Report Number(s):
- CONF-950522--; ISBN 0-7918-1305-3
- Country of Publication:
- United States
- Language:
- English
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